Northbound SR 99 closed through downtown Seattle this weekend

**UPDATE** As of 3 p.m. Sunday, northbound SR 99 is open from South Atlantic Street to the Western Avenue off-ramp. Northbound SR 99 remains closed from the south end of the Battery Street Tunnel to Valley Street.

Construction at the future north and south portals of the SR 99 tunnel will turn northbound SR 99 through Seattle into a no-go zone this weekend. All lanes of northbound SR 99 will be closed through downtown Seattle from 10 p.m. Friday, June 20 to 5 a.m. Monday, June 23.

Closure details

At 10 p.m. Friday, crews working for Seattle Tunnel Partners will close all lanes of northbound SR 99 between South Spokane Street and the south end of the Battery Street Tunnel. During the closure crews will complete work to shift northbound SR 99 traffic onto new lanes through the tunnel construction site near the stadiums. This post provides additional information about why the shift is necessary.

At 5 a.m. Saturday, the Rock ‘n’ Roll Seattle Marathon and Half Marathon will extend this closure of northbound SR 99 north to Valley Street in South Lake Union. The closure won’t end when the marathon ends. At 4 p.m. Saturday, crews working for Atkinson Construction will take over the closed area to move utilities out of the way of upcoming work related to construction of the SR 99 tunnel’s future north portal. They will also close the left lane of southbound SR 99 between Republican and Thomas streets just north of the Battery Street Tunnel.

All lanes will reopen by 5 a.m. Monday.

Busy weekend around Seattle

There’s a lot happening on the roads around Seattle this weekend, and we could use your help to keep traffic moving. Before heading out, drivers should plan their trip by using WSDOT’s traffic tools.